package controller;

import model.Blog;
import model.BlogDao;
import model.User;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/blogDetele")
public class BlogDeleteServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //先检测当前用户登录状态
        HttpSession session=req.getSession(false);
        if (session==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前用户未登录，不能删除");
            return;
        }
        User user= (User) session.getAttribute("user");
        if (user==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前用户未登录，不能删除");
            return;
        }

        //2.获取请求参数中的blogId
        String blogId=req.getParameter("blogId");
        if (blogId==null || "".equals(blogId)){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("blogId参数错误，不能删除！");
            return;
        }

        //3.获取到要删除的博客信息
        BlogDao blogDao=new BlogDao();
        Blog blog=blogDao.selectOne(Integer.parseInt(blogId));
        if (blog==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前要删除的博客不存在！");
            return;
        }

        //4.再次校验，当前的用户是否就是博客的作者
        if (user.getUserId()!=blog.getUserId()){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前登录的用户不是博客的作者，无法进行删除操作！");
            return;
        }

        //5.确认无误，进行删除
        blogDao.delete(Integer.parseInt(blogId));

        //6.删除完成后重定向到博客列表页
        resp.sendRedirect("blog_list.html");
    }
}
